Alex Power has small appearances in X-23 volume 3 #14 and 15, the two middle parts of the 4-part “Chaos Theory” story guest-starring the Future Foundation.
It’s really quite minor. In issue 14, he appears in 4 panels across 3 pages, one of which we only see his legs and feet on a hover board. He gets 2 whole lines. In issue 15, he’s seen in the background of one panel at the end of the issue. Gorgeous Phil Noto art and Marjorie Liu is an excellent writer but for our purposes it’s entirely skippable other than to establish that Alex Power has met X-23. It’s been added to the end of Limbo Part 4 Phase Five.